<!DOCTYPE HTML>
<html>
<head>
   <!-- <base href="localhost://localhost:8080/"/>-->
    <title>My WebSocket</title>
</head>

<body>
Welcome  <span id="onlineNum" style="padding-left: 6px;color: #B5CC18"></span><br/>
<input id="text" type="text"/>
<button onclick="send()">Send</button>
<button onclick="openc()">Open</button>
<button onclick="closeWebSocket()">Close</button>
<div id="message">
</div>
</body>

<script type="text/javascript">
    var websocket = null;

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket() {
        websocket.close();
    }

    //发送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send(message);
    }

    //创建连接
    function openc() {
        //判断当前浏览器是否支持WebSocket
        if ('WebSocket' in window) {
            websocket = new WebSocket("ws://localhost:8080/websocket");
        } else {
            alert('Not support websocket')
        }

        //连接发生错误的回调方法
        websocket.onerror = function () {
            setMessageInnerHTML("error");
        };

        //连接成功建立的回调方法
        websocket.onopen = function (event) {
            setMessageInnerHTML("open");
        }

        //接收到消息的回调方法
        websocket.onmessage = function (event) {
            console.log("uyiuy:", event);
            var a=event.data.split("-");
            setMessageInnerHTML(a[0]);
            document.getElementById('onlineNum').innerHTML="在线人数："+a[1];

        }

        //连接关闭的回调方法
        websocket.onclose = function () {
            setMessageInnerHTML("close");
        }

        //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
        window.onbeforeunload = function () {
            websocket.close();
        }
    }
</script>
</html>